William stanley



(No' Model.)

' W. STANLEY, Jr.

ARMATURE FOR DYNAMO' ELECTRIC MACHINES. No. 313,894 Patented Mar. 17,1885.

UNITED STATES PATENT OFFICE.

l/VILLIAM STANLEY, JR., OF PITTSBURG, PENNSYLVANIA.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 313,894, dated March1'7, 1885.

Application filed September 23, 1884. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM STANLEY, J r., a citizen of the UnitedStates, residing in the city of Pittsburg, in the State of Pennsylvania,have invented certain new and useful Improvements in Armatures forDynamo-Electric Machines, of which the following is a specification.

My invention relates especially to that class of armatures known as drumarmatures, in which the Wires are wound longitudinally upon the surfaceof a revolving drum or core; and the object of my improvements is toprovide a core for such armatures which can be easily and cheaplyconstructed and shall be free from the so-called Foucault currents.Heretofore such armaturecores have generally been constructed of anumber of separate plates of iron arranged side by side with layers ofinsulating material interposed between them, in order to prevent theproduction of currents in the core itself. Such armature-cores aredifficult to make, and add greatly to the cost of the machine.

In constructing my armature I avoid the use of separate plates anddispense with insulating material by making an armature-core of a seriesof parallel disks and shaft-bearings and bars connecting the same, castof iron in one piece. The cost of such an armature-core is but a smallfraction of that of one constructed in the ordinary manner, while it isfree from induced Foucault currents, and consequent heating of the ironand loss of energy.

In the drawings, Figure 1 shows a side elevation of the armature-core;Fig. 2, a longitudinal section, and Figs. 3 and 4 cross-sectional views.

A A are the end plates; at a a, intermediate plates or disks; B B B,bars connecting the glates, and O O perforations in the end plates,

The same letters refer to similar parts in all the drawings.

As appears from the drawings, my armature-cores are constructed in theform of a series of perforated disks a, parallel to each other and atright angles to the axis of the armature. These rings are separated fromeach other by a short distance, so as to insulate them from each otherat their outer circumference and afford a free circulation of air be- '1tween them. Through the center of each of the disks a is a largeopening, so that the armature-core is hollow throughout its lengthbetween the end plates, A A. The end plates, A A, are made thicker thanthe intermediate disks as, and are provided with projections D D, fittedto receive the shaft of the armature, which is keyed in the slot d. Theend plates, A A, are pierced with openings 0, which, in connection withthe opening through the center of the core and the spaces between thedisks a, permit a current of air to circulate freely throughout thearmature, so as to cool it and prevent heating of the metal during theoperation of the machine. Along the inner edge of the perforated disks arun the bars B, connecting the disks a and the end plates, A A, anduniting the whole into one piece. The bars B should be made ofsufficient size to prevent any bending or warping of the armature, butshould not extend up very far toward the outer circumference of thedisks a.

It is well known that if a hollow cylinder be magnetized the wholecharge will appear on its outer surface, while none can be detected onits inner surface.

Any Foucault currents that may be generated in my armaturecore duringthe operation of the dynamo are confined to the outer circumference ofthe disks a, and the space which such currents can traverse is measuredby the thickness of each disk. The currents are prevented from passingfrom disk to disk by the insulating bodies of air between the disks, andas the connecting-bars B are placed at the in ner circumference of theperforated disks the currents that may be generated on the outercircumference do not extend to the connecting-bars.

I am aware that the armature-cores of dy namo-electric machines haveheretofore been made of flat disks parallel to each other and at rightangles to the axis of the armature, and also that cast-iron has beenused as a material in their construction, and I do not claim either ofthese, broadly.

What I do claim as new, and desire to secure by Letters Patent, is

1. An armature-core consisting of the end plates, A, disks a, and barsB, the whole cast of iron in a single piece, substantially as de- Anarnmture-core consisting of a series scribed. of annular disks composedof a single piece IO 2. The combination, in an armature-core, of ofcast-iron, substantially as shown and deend plates, A, perforated disksa, and bars B scribed.

5 along the inner circumference of the disks, WILLIAM STANLEY, JR.

rigidly uniting the disks and end plates into Witnesses: a single piece,substantially as described, and SANDS 1 RANDALL,

for the purposes set forth. CHAS. G. CLAGGETT.

